<template>
  <div>
    <!-- 面包屑导航区域 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>分类参数</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图区域 -->
    <el-card>
      <!-- 警告区域 -->
      <el-alert title="注意：只允许为第三级分类设置相关参数！" type="warning" show-icon :closable="false">
      </el-alert>

      <!-- 选择商品分类区域 -->
      <el-row class="cat-opt">
        <el-col>
          <span>选择商品分类：</span>
          <!-- 选择商品分类的级联选择框 -->
          <el-cascader v-model="selectedCateKeys" :options="cateList" :props="cateProps" @change="cateChange"></el-cascader>
        </el-col>
      </el-row>

      <!-- tab页区域 -->
      <el-tabs v-model="activeName" @tab-click="handleTabClick">
        <!-- 添加动态参数的面板 -->
        <el-tab-pane label="动态参数" name="many">
          <!-- 按钮 -->
          <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible = true">添加参数</el-button>

          <!-- 动态参数表格 -->
          <el-table :data="manyTableData" border stripe>
            <!-- 展开行 -->
            <el-table-column type="expand">
              <template slot-scope="scope">
                <!-- 循环渲染tag标签 -->
                <el-tag v-for="(item, index) in scope.row.attr_vals" :key="index" closable @close="handelTagClose(index,scope.row)">{{item}}</el-tag>
                <!-- 输入的文本框 -->
                <el-input class="input-new-tag" v-if="scope.row.inputVisible" v-model="scope.row.inputValue" ref="saveTagInput" size="small" @keyup.enter.native="handleInputConfirm(scope.row)" @blur="handleInputConfirm(scope.row)">
                </el-input>
                <!-- 添加tag按钮 -->
                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>

              </template>
            </el-table-column>

            <!-- 索引列 -->
            <el-table-column type="index"></el-table-column>

            <el-table-column label="参数名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <!-- 按钮 -->
                <el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                <el-button type="danger" icon="el-icon-delete" size="mini" @click="removeParamById(scope.row.attr_id)">删除</el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>

        <!-- 添加静态属性的面板 -->
        <el-tab-pane label="静态属性" name="only">
          <!-- 按钮 -->
          <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible = true">添加属性</el-button>

          <!-- 静态属性表格 -->
          <el-table :data="onlyTableData" border stripe>
            <!-- 展开行 -->
            <el-table-column type="expand">
              <template slot-scope="scope">
                <!-- 循环渲染tag标签 -->
                <el-tag v-for="(item, index) in scope.row.attr_vals" :key="index" closable @close="handelTagClose(index,scope.row)">{{item}}</el-tag>
                <!-- 输入的文本框 -->
                <el-input class="input-new-tag" v-if="scope.row.inputVisible" v-model="scope.row.inputValue" ref="saveTagInput" size="small" @keyup.enter.native="handleInputConfirm(scope.row)" @blur="handleInputConfirm(scope.row)">
                </el-input>
                <!-- 添加tag按钮 -->
                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>

              </template>
            </el-table-column>
            <!-- 索引列 -->
            <el-table-column type="index"></el-table-column>

            <el-table-column label="属性名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <!-- 按钮 -->
                <el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                <el-button type="danger" icon="el-icon-delete" size="mini" @click="removeParamById(scope.row.attr_id)">删除</el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
      </el-tabs>

    </el-card>

    <!-- 添加参数的对话框 -->
    <el-dialog :title="'添加'+titleText" :visible.sync="addDialogVisible" width="50%" @closed="addDialogClosed">
      <!-- 主体内容 -->
      <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px">
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="addForm.attr_name"></el-input>
        </el-form-item>
      </el-form>

      <!-- 底部 -->
      <span slot="footer" class="dialog-footer">
        <el-button @click="addDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addParams">确 定</el-button>
      </span>
    </el-dialog>

    <!-- 修改参数的对话框 -->
    <el-dialog :title="'修改'+titleText" :visible.sync="editDialogVisable" width="50%" @closed="addDialogClosed">
      <!-- 主体内容 -->
      <el-form :model="editForm" :rules="addFormRules" ref="addFormRef" label-width="100px">
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="editForm.attr_name"></el-input>
        </el-form-item>
      </el-form>

      <!-- 底部 -->
      <span slot="footer" class="dialog-footer">
        <el-button @click="editDialogVisable = false">取 消</el-button>
        <el-button type="primary" @click="editParams">确 定</el-button>
      </span>
    </el-dialog>

  </div>
</template>

<script>
export default {
  data() {
    return {
      // 商品分类数组
      cateList: [],
      // 级联选择框配置对象
      cateProps: {
        expandTrigger: 'hover',
        value: 'cat_id',
        label: 'cat_name',
        children: 'children'
      },
      // 级联选择框绑定的数组
      selectedCateKeys: [],
      // 被激活的页签名称
      activeName: 'many',
      // 动态参数
      manyTableData: [],
      // 静态属性
      onlyTableData: [],
      // 控制添加对话框的显示与隐藏
      addDialogVisible: false,
      // 控制修改对话框的显示与隐藏
      editDialogVisable: false,
      // 添加表单数据对象
      addForm: {
        attr_name: ''
      },
      // 修改表单数据对象
      editForm: {},
      // 添加表单验证规则
      addFormRules: {
        attr_name: [
          { required: true, message: '请输入参数名称', trigger: 'blur' }
        ]
      },
      // 控制按钮与文本框的切换显示
      inputVisible: false,
      inputValue: ''
    }
  },
  created() {
    this.getCateList()
  },
  methods: {
    // 获取所有商品分类
    async getCateList() {
      const { data: res } = await this.$http.get('categories')
      if (res.meta.status !== 200) return this.$message.error('获取商品分类失败！')
      this.cateList = res.data
      //   console.log(this.cateList)
    },
    // 级联选择框选项变化时触发
    cateChange() {
      this.getParamsData()
    },
    // tab页签点击事件
    handleTabClick() {
      console.log(this.activeName)
      this.getParamsData()
    },
    // 获取参数列表数据
    async getParamsData() {
      // 选中的不是三级分类，清空表格与选中
      if (this.selectedCateKeys.length !== 3) {
        this.selectedCateKeys = []
        this.manyTableData = []
        this.onlyTableData = []
        return 0
      }
      //   console.log(this.selectedCateKeys)
      // 根据所选的分类id和当前的面板来获取对应的参数
      const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, { params: { sel: this.activeName } })

      if (res.meta.status !== 200) this.$message.error('获取参数列表失败！')

      //   console.log(res.data)

      res.data.forEach(item => {
        // 将原来attr_vals字符串用空格分隔成数组，并重新赋给atr_vals，三元表达式判断为空不分割字符串
        item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : []
        // 控制文本框的显示与隐藏
        item.inputVisible = false
        // 文本框的值
        item.inputValue = ''
      })

      if (this.activeName === 'many') {
        this.manyTableData = res.data
      } else {
        this.onlyTableData = res.data
      }
    },
    // 添加对话框关闭事件
    addDialogClosed() {
      this.$refs.addFormRef.resetFields()
    },
    // 点击按钮添加参数
    addParams() {
      this.$refs.addFormRef.validate(async valid => {
        // console.log(valid)
        if (!valid) return 0
        const { data: res } = await this.$http.post(`categories/${this.cateId}/attributes`, {
          attr_name: this.addForm.attr_name,
          attr_sel: this.activeName
        })
        if (res.meta.status !== 201) return this.$message.error('添加参数失败！')

        this.$message.success('添加参数成功！')
        this.addDialogVisible = false
        this.getParamsData()
      })
    },
    // 显示修改参数对话框
    async showEditDialog(attrId) {
      const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes/${attrId}`, { params: { attr_sel: this.activeName } })
      if (res.meta.status !== 200) return this.$message.error('获取参数信息失败！')

      this.editForm = res.data
      this.editDialogVisable = true
    },
    // 点击按钮修改参数
    editParams() {
      this.$refs.addFormRef.validate(async valid => {
        if (!valid) return 0

        const { data: res } = await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`, { attr_name: this.editForm.attr_name, attr_sel: this.activeName })

        if (res.meta.status !== 200) return this.$message.error('修改参数失败！')

        this.$message.success('修改参数成功！')
        this.editDialogVisable = false
        this.getParamsData()
      })
    },
    // 点击按钮，删除参数
    async removeParamById(attrId) {
      const confirmRes = await this.$confirm('此操作将永久删除该参数，是否继续', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).catch(err => err)
      // console.log(confirmRes)

      if (confirmRes !== 'confirm') return this.$message.info('删除操作已取消')

      const { data: res } = await this.$http.delete(`categories/${this.cateId}/attributes/${attrId}`)

      if (res.meta.status !== 200) return this.$message.error('删除参数失败！')

      this.$message.success('删除参数成功！')
      this.getParamsData()
    },
    // 文本框失去焦点或摁下enter建触发
    handleInputConfirm(row) {
      // console.log(row)
      if (row.inputValue.trim().length === 0) {
        row.inputValue = ''
        row.inputVisible = false
        return 0
      }
      // 输入有效内容进行后续处理
      // 添加进数组中
      row.attr_vals.push(row.inputValue.trim())
      row.inputValue = ''
      row.inputVisible = false

      // 发起请求
      this.saveAttrValues(row)
    },
    // 点击按钮显示文本框
    showInput(row) {
      row.inputVisible = true
      // 文本框自动获取焦点
      // $nextTick方法，当页面上的元素被重新渲染后，才会执行回调函数中的代码
      this.$nextTick(_ => {
        this.$refs.saveTagInput.$refs.input.focus()
      })
    },
    // 删除对应参数（tag）
    handelTagClose(i, row) {
      // splice会修改原数组
      row.attr_vals.splice(i, 1)
      this.saveAttrValues(row)
    },
    // 将attr_vals保存
    async saveAttrValues(row) {
      // 发起请求，保存参数
      const { data: res } = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`, {
        attr_name: row.attr_name,
        attr_sel: row.attr_sel,
        attr_vals: row.attr_vals.join(' ')
      })

      if (res.meta.status !== 200) return this.$message.error('修改参数失败！')

      this.$message.success('修改参数成功！')
    }
  },
  // 计算属性
  computed: {
    // 如果按钮需要禁用返回true
    isBtnDisabled() {
      if (this.selectedCateKeys.length !== 3) return true

      return false
    },
    // 当前选中的三级分类id
    cateId() {
      if (this.selectedCateKeys.length === 3) return this.selectedCateKeys[2]

      return null
    },
    // 对话框标题
    titleText() {
      if (this.activeName === 'many') return '动态参数'
      else return '静态属性'
    }
  }
}
</script>

<style lang="less" scoped>
.cat-opt {
  margin: 15px 0;
}
.el-tag {
  margin: 10px;
}
.input-new-tag {
  width: 120px;
}
</style>
